I have an LG 27UK850-W monitor, which comes with a DisplayPort, a HDMI, and a USB-C cable. The USB-C cable is documented as being for both display as well as for data transfer (the monitor also has a USB socket for quick dongle access) I've connected the DisplayPort and USB-C cables to my computer, but now Windows keeps giving me an error, saying that Display connection might be limited (linking me to this site). The monitor otherwise functions fine and the USB port on it also works.
If I disconnect the USB-C cable, the errors go away and the display still works (since it's connected via DisplayPort), but the USB port on the monitor also stops working, so I'd prefer to leave the USB-C cable connected.
So how do I tell Windows that I only want to use the USB-C connection for data transfer, not for display?
61 Answer
Here's a workaround that helped me.
I have 2 HP Z42n G2 displays connected via DisplayPort and also USB-C to a Windows 10 machine, so I can use them as displays and USB hubs simultaneously.
The workaround was disabling USB-specific notifications via Start -> Settings -> Devices -> USB and uncheck "Notify me if there are issues connecting to USB devices". Now it doesn't complain anymore, monitors go to sleep as expected, USB devices remain connected, etc.
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